[patch 35/40] radeon: set the address to access the GART table on the CPU side correctly

-stable review patch. If anyone has any objections, please let us know.

------------------From: Dave Airlie <airlied@linux.ie>

Upstream as 7fc86860cf73e060ab8ed9763010dfe5b5389b1c

This code relied on the CPU and GPU address for the aperture being the same,On some r5xx hardware I was playing with I noticed that this isn't always true.This fixes issues seen on some r400 cards. (bugs.freedesktop.org 9957)